21166532 has 24 divisors (see below), whose sum is σ = 40689600. Its totient is φ = 9589536.

The previous prime is 21166529. The next prime is 21166559. The reversal of 21166532 is 23566112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4307 + ... + 7802.

It is an arithmetic number, because the mean of its divisors is an integer number (1695400).

Almost surely, 2^21166532 is an apocalyptic number.

It is an amenable number.

21166532 is a deficient number, since it is larger than the sum of its proper divisors (19523068).

21166532 is a wasteful number, since it uses less digits than its factorization.

21166532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12155 (or 12153 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 21166532 is about 4600.7099452150. The cubic root of 21166532 is about 276.6197827040.

The spelling of 21166532 in words is "twenty-one million, one hundred sixty-six thousand, five hundred thirty-two".